I could devote all my time to recycling, reducing carbon emissions, not driving, voting, not eating red meat, including forcing everyone i know to do the same - and the net result would be an iota of a drop in the ocean of change. i.e. nothing.
As others have said, until there is a global shift on how the world operates and the major oil companies, cruise lines, and airlines all shut down, nothing you or i can do will matter.
Edit: folks still don't get it. It's not a matter of apathy, it's pragmatism. You will never, ever convince enough people to make a significant change relative to the big consumers. You will be dealing with the people who literally pollute and consume out of spite, and/or principle, or ignorance. For every thing you do, someone's doing the opposite. We failed the planet a long time ago though lack of education and giving too many greedy people power. The world is too large and the snowball is over the hill.
The amount of fuel used by the cruise industry in about 1 minute, on average, is more fuel than you or I or any normal person would consume in their entire lifetime, by a lot. That's on the low end. They consume 500,000 to 1.5 mil gallons an hour. The average person uses maybe 20 to 50k gallons their entire lives. You'd have to convince millions and millions of people to stop driving completely for 40 years to offset that. Tens of millions probably.
Not gonna happen. That's just one industry.
Everyone's not gonna just stop flying. Or stop driving. Or stop eating meat. It's idealistic and impossible and frankly imaginary, no matter how much it may be necessary.
Why waste your time and energy doing things that will do nothing? Focus your efforts elsewhere. Policy change probably has the best chance of helping. But then I point back to the people actively and purposely thwarting any attempts at curbing consumption, and these people are billionaires etc. And at least in the USA, running the country.
I'm just laughing cause you still don't get it. Nothing you do will matter. Yes, that's depressing, and it's also true. The numbers don't check out. You can wave it away all you want, nothing you do will matter. Sorry. And yes that should make you angry. But that is what I mean by pragmatism. It's a waste of time and energy to be angry. To believe you can do something about it. Instead, focus on being happy and making life better for others in ways we can, in the time we have.